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Investigating Osmosis In Potato Cells

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Investigating Osmosis In Potato Cells Introduction Osmosis is a form of diffusion but specifically for water, it is the diffusion of water from a dilute solution to a more concentrated solution through a semi permeable membrane. In this experiment we used water because in osmosis only water molecules can be used Prediction Tubes Predictions Explanation 1 and 2 The mass and length will go up The concentration is less in the chip 3 and 4 The mass and length will stay the same The concentration is the same as in the chip 5 and 6 The mass and length will go down The concentration is more in the chip Method Apparatus * Cork borer * Scalpel * 6 boiling tubes * 6 potato chips * Distilled water * 2.8 M sucrose * Electronic scales * Ruler * Pen Firstly we cut 6 potato chips with a cork borer, and then we squared off the edges with a scalpel, so they were all the same size, so that it could be made a fair test. ...read more.


Mass (g) Length (mm) Mass (g) Length (mm) Mass (g) Length (mm) 1 0.4 3.6 46 4.2 49 +16.7 +6.5 2 0.4 3.5 45 4.0 48 +14.3 +6.7 3 0.0 4.1 55 3.6 53 -12.2 -3.6 4 0.0 4.0 52 3.5 51 -14.3 -1.9 5 1.0 2.7 46 1.8 38 -33.3 -17.4 6 1.0 2.9 52 2.4 45 -17.2 -13.5 To make the results as accurate as possible we made sure that we patted the chips dry before we measured the mass and length of them, we also measure to the most accurate number possible with the apparatus we had. We also took accurate averages to help us understand how the mass and length of the chips had changed. Conclusion The results show that in Tubes 1 and 2 the mass and the length went up Tubes 3 and 4 the mass and the length of the chips went down slightly Tubes 5 and 6 the mass and the length went down a lot The pattern on my graph shows that the mass changed a lot more than the length in this experiment. ...read more.


Probably the hardest part of the experiment was measuring the final lengths of the chip left in the 1.0M of sucrose, because it was very soft and flaccid, and it was hard to measure the length because it could stretch of squash up. To overcome this problem I squashed the flaccid chips into rectangular shapes, this was the most accurate way of measuring the chips' length. The results of Tubes 3 and 4 surprised me, as I thought the chips mass and length would stay the same, as it didn't change in shape in any way, I'm sure there is a scientific explanation of why this happened, but I personally do not know why, with my scientific knowledge. This problem lessened the accuracy of my results, but in comparison with other experiments, the results seem as reliable and accurate as possible under the conditions. I think the accuracy and reliability of the results could be improved, they might be more accurate, if 3 experiments were made and an average was taken to make sure all the readings were accurate. Also it could have been improved if we had chips that were all the same length, then more accurate comparisons could have been made. ...read more.

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